Hole-forming device

ABSTRACT

A hole-forming device includes a base member having a hole-forming projection facing a bottom of a can. The hole-forming projection is formed on an upper surface of the base member. The base member is slidable upward to the upper part of a case by pushing a pressing member. The hole-forming projection is normally held in the case for safety.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a hole-forming device that allows holes to be formed in a safe and reliable manner in cans used for spraying their contents such as spray cans, gas tank cartridges for stoves, and the like. When these containers are to be discarded, these holes are formed as vent holes to release residual gas.

[0002] When discarding spray cans, gas tank cartridges for stoves, and the like, after use, residual gas inside the container may not be completely discharged. This residual gas is often left inside the container when it is discarded. This is extremely dangerous for workers during the disposal operation, and can also have a negative impact on the environment.

[0003] For these reasons, various devices have been developed to form gas venting holes in cans so that the gas in containers can be discharged. Many of these form a gas venting hole for discharging residual gas by puncturing a side surface or a bottom surface of a container using a plate material or the like having a nail, a needle, or a sharpened end. This type of device has been the most common.

[0004] As described above, many of the dedicated devices used to form gas venting holes for the discharge of gas from used containers involves a sharp end, i.e., a nail-shaped end. However, when forming holes with a nail-shaped member, the puncturing of the container with the nail-shaped member is dangerous.

[0005] In particular, since a can is cylindrical in shape, the side surface is a curved side surface. Also, the bottom surface is almost always formed as a concave spherical surface. Thus, when a tool having a nail-shaped member is to be driven to puncture a container, the end of the nail-shaped member can very easily slip along the side surface of the container if driven at an orientation that is even slightly shifted from a perpendicular orientation. This makes forming a gas-venting hole difficult.

[0006] Of course, if the end of the nail-shaped member slips when being driven in, this is also dangerous for the worker performing the operation. Thus, when forming a gas venting hole in a can using a tool having a nail-shaped member, the nail-shaped member must be kept in a fixed and stable state. Among the various hole-forming devices, almost none take this issue into consideration.

SUMMARY OF THE INVENTION

[0007] It is an object of the invention to provide a hole-forming device operable with both ease and safety.

[0008] Another important object of the present invention is to provide a hole-forming device performing hole forming in the bottom of cans without fail, which is mechanically simple.

[0009] A further object of the present invention is to provide a hole-forming device having a variety of materials applicable to the present invention, for example, metals, synthetic resin, plastics and the like, which can prepare for hole-forming with a simple operation.

[0010] An additional object of the present invention is to provide a hole-forming device relieving the shock when forming a hole in a bottom of cans.

[0011] As a result of diligent research into this problem, the present inventor has found a safe and reliable way to form gas vent holes for cans and has overcome the problems described above by providing a hole-forming device that includes a base member having a hole-forming projection on it and having a pressing member located under the base member. Both the base member and the pressing member are accommodated in a case. The pressing member slides in the case and pushes the base member towards the upper part of the case.

[0012] The present invention also provides a hole-forming device which includes a pressing portion fixing the base member roughly so that the hole-forming projection is normally accommodated in the case and having a fitting chip formed in either the base member or the pressing member. The base member is engaged with the pressing member, a part of which is taken out by way of the fitting chip (fitting chips). The pressing member pushes (presses) the base member to the upper part of the case.

[0013] Briefly stated, the present invention provides a hole-forming device which includes a base member having a pressured slope and a pressing slope. The pressured slope is formed as the lower end surface of the base member. The pressing slope is formed as the upper end surface of the pressing member. The lower end part of the pressing member sticks out from the lower end of the case by circumferential rotation of the pressing member to the base member.

[0014] Further stated, the present invention provides a hole-forming device which includes the base member having a pressured unflat surface and the pressing member having a pressing unflat surface. The pressing unflat surface is formed to put in contact with the pressured unflat surface.

[0015] According to an embodiment of the invention, there is provided a hole-forming device comprising: a case fittable to a bottom portion of a can receptacle; a base member accommodated in said case; said base member slidable along the longitudinal direction of said case; a hole-forming projection being formed on an upper surface of said base member; a pressing portion fixing roughly said base member so that said hole-forming projection is normally accommodated in said case; a pressing member placed under said base member; upper end of said pressing member being inserted in a lower part of said base member; a fitting chip formed at least in either said base member or said pressing member; and whereby said base member is engaged with said pressing member a part of which is taken out of said base member, and said base member is slidable upward to the upper part of said case by pushing said pressing member.

[0016] The above, and other objects, features and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate the same elements.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017]FIG. 1(A) is a partially cutaway view in perspective of a hole-forming device;

[0018]FIG. 1(B) is a partially cutaway view in perspective of a hole-forming device ready for forming a hole in a can;

[0019]FIG. 2(A) is a longitudinal sectional view of a hole-forming device;

[0020]FIG. 2(B) is an exploded perspective view of a hole-forming device;

[0021]FIG. 3(A) is a partial cross sectional side view showing a hole-forming device fitted to the bottom of cans;

[0022]FIG. 3(B) is a partial cross sectional side view of a bottom of a can ready for a hole to be formed;

[0023]FIG. 3(C) is a partial cross sectional side view of a bottom of a can in which the gas is sprayed out of the hole;

[0024]FIG. 4(A) is a longitudinal sectional side view showing a hole-forming device ready for forming a hole in a can;

[0025]FIG. 4(B) is a longitudinal sectional side view showing a hole-forming device about to form a hole in a can;

[0026]FIG. 5(A) is a perspective view showing only the main elements in the second modified first embodiment;

[0027]FIG. 5(B) is a longitudinal sectional side view showing a hole-forming device in normal condition in the second modified first embodiment;

[0028]FIG. 6 is a longitudinal sectional side view of a hole-forming device in the second modified first embodiment ready for forming a hole in a can;

[0029]FIG. 7 is a longitudinal sectional side view of a hole-forming device whose pressing portion is formed as a projection;

[0030]FIG. 8(A) is a longitudinal sectional side view of a hole-forming device in the second embodiment;

[0031]FIG. 8(B) is a partially cutaway perspective view of main elements of a hole-forming device in the second embodiment;

[0032]FIG. 9(A) is a longitudinal sectional side view of a hole-forming device in the second embodiment ready for forming a hole in a can;

[0033]FIG. 9(B) is a longitudinal sectional side view of a hole-forming device in the second embodiment showing completed hole forming;

[0034]FIG. 10(A) is a longitudinal sectional side view of the second modified second embodiment;

[0035]FIG. 10(B) is a perspective view showing only the main elements of the second modified second embodiment;

[0036]FIG. 11 is a longitudinal sectional side view of the second modified second embodiment showing completed hole-forming;

[0037]FIG. 12(A) is an exploded perspective view showing only the main elements of the second modified second embodiment; and

[0038]FIG. 12(B) is a longitudinal sectional side view of another variation of the second modified second embodiment ready for forming a hole in a can.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0039] Referring to the drawings, a description will be given of the present invention. For the first embodiment of the present invention, a hole-forming device is comprised of a case 1, a base member 2, a hole-forming projection 3 and a pressing member 5 as shown in FIG. 1, FIG. 2 and the others. The case 1 is cylindrically shaped. The upper end of a circumferential surface 1 a of the case 1 has a top surface 1 b. A piercing hole 1 c is provided at the center of the top surface 1 b so that the hole-forming projection 3 can go through. As a result, as shown in FIG. 4(B), the hole-forming projection 3 goes through the piercing hole 1 c and projects out of the upper end of the case 1.

[0040] The case 1 can be fit to the bottom portion 10 of a can receptacle C, as shown in FIG. 3 (A). And the case 1 can be located at the center (including near center) of the bottom portion 10 through an installing member 9 which can be fitted freely to the bottom portion 10. The installing member 9 is comprised of a discoid 9 a and a fitting portion 9 b. The fitting portion 9 b can be formed around the discoid 9 a. The case 1 can be fitted to the can receptacle C, as shown in FIG. 3(A), so that the fitting portion 9 b is fitted to the circumference of the bottom portion 10.

[0041] A case supporting portion 9 c can be formed at the center of the discoid 9 a. Therefore, the case 1 is supported by the case supporting portion 9 c. The case supporting portion 9 c can be made to hold the case 1 along the longitudinal direction of the can receptacle C. In addition, as shown in FIG. 4(B), the case supporting portion 9 c can be made so that the hole-forming projection 3 can penetrate perpendicularly at the center of the bottom portion 10 of can receptacle C. The case 1 can be fixed together with the case supporting portion 9 c by various means for fixing, for example, spot-welding, press-fixing, a strong adhesive and the like.

[0042] Next, the base member 2 is formed into a cylindrical shape just like a cap of a bottle. An upper surface 2 b is formed on the top end of a sliding circumferential surface 2 a. The hole-forming projection 3 can be provided on the upper surface 2 b. Further, as shown in FIG. 1(A), FIG. 1(B), FIG. 4(A) and FIG. 4(B), there exists an insert space portion 2 s under the base member 2. To be clear, the insert space portion 2 s is a space surrounded by the sliding circumferential surface 2 a and the upper surface 2 b.

[0043] The base member 2 can be accommodated in the circumferential surface 1 a of the case 1 so that the case 1 can be slidable along the longitudinal direction of the case 1. A pressing portion 4 can be provided between the top surface 1 b (FIG. 2A) of the case 1 and the upper surface 2 b of the base member 2. The pressing portion 4, as shown in FIG. 2(A), should normally be accommodated in the case 1 so that the hole-forming projection 3 wouldn't project out of the piercing hole 1c unnecessarily. It is preferable that the hole-forming projection 3 can project out of the piercing hole 1 c only in case of necessity.

[0044] To be clear, a coiled spring 4 a can be used for the pressing portion 4 as shown in FIG. 2(A) and 2(B). The upper surface 2 b of the base member 2 can be pressed elastically and be movable (slidable) downward to the lower part of the case 1.

[0045] The pressing portion 4 can be modified by notching a part of the circumferential surface 1 a of the case 1, bending the notches to the inside of the case 1, and forming the notched circumferential surface 1 a as a stopping projection 4 b, as shown in FIG. 7. One or more stopping projections 4 b can be provided and should be made in such a manner as to be broken easily by pressure.

[0046] The stopping projection 4 b holds the upper surface 2 b of the base member 2 and the hole-forming projection 3 is held to be usually accommodated in the case 1. Further, when the base member 2 moves upwards to upper part of the case 1 by pressure of the pressing member 5, the stopping projection 4 b is pushed down by the force of such moving and the hole-forming projection 3 is projected out of the top surface of the case 1. Another modified stopping projection 4 b can be made in such a manner as to be formed as a small protruding portion which protrudes slightly to the inside of the case 1 (not shown in Figures).

[0047] Next, the pressing member 5 can be cylindrical shaped (including near cylindrical). The upper part of the pressing member 5 can be inserted to the insert space portion 2 s of the base member 2 as shown in FIGS. 2(A) and 2 (B). Several fitting chips 6 are formed at the upper part of the pressing member 5. The fitting chips 6 should be open to the outside of the pressing member 5 and be flexible as shown in FIGS. 2(A) and 2(B).

[0048] When the upper end of the pressing member 5 is inserted into the insert space portion 2 s of the base member 2, the fitting chips 6 hit on the inner surface of the upper surface 2 b sporadically, as shown in FIG. 2(A). Moreover, when the upper part of the pressing member 5 is taken out of the insert space portion 2 s of the base member 2, each of the fitting chips 6 are supposed to be open, as shown in FIG. 4(A).

[0049] The fitting chips 6 which are formed in the pressing member 5 touch (contact) the inner surface of the circumferential surface 1 a of the case 1. The fitting chips 6 also touch/contact and engage with the lower end of the sliding circumferential surface 2 a of the base member 2. Once the upper end of the pressing member 5 is taken out of the fitting chips 6, there is no need for the upper end of the pressing member 5 to be deeply pushed into the insert space portion 2 s. Accordingly, the base member 2 can be ready to be pushed inside the case 1 by the pressing member 5 as shown in FIG. 1(B) and FIG. 4(A), thus, projection 3 is ready to form a hole in the bottom portion 10 of the can receptacle C.

[0050] Next, a flange 5 d is provided in the lower end of the pressing member 5, as shown in FIG. 4(B). The flange 5 d is exposed at the bottom of the case 1. When the flange 5 d is pushed to the upper part of the case 1, or when the flange 5 d is hit strongly with a hammer or the like, the pressing member 5 is moved with the flange 5 d. After that, the movement of the pressing member 5 causes a series of other movements, that is, a movement of the base member 2 and a movement of the hole-forming projection 3. As a result of the series of the movements, a hole is formed in the bottom portion 10 of the can receptacle C.

[0051] The flange 5 d is placed approximately at the bottom of the case 1 such that the upper end of the pressing member 5 is fully inserted into the inserted space portion 2 s of the base member 2. If the upper part of the pressing member 5 is taken out of the insert space portion 2 s of the base member 2, as shown in FIG. 4(B), the flange 5 d which is exposed at the bottom of the case 1 is separated from the lower end of the case 1.

[0052] In the second modified first embodiment of the present invention, the fitting chip 6 is modified to form the side of the base member 2 as shown in FIGS. 5(A) and 5(B). The fitting chip 6 formed at the side of the base member 2 is formed on the sliding circumferential surface 2 a of the base member 2, as shown in FIG. 5(B). To be clear, line guiding groove portions are made on the sliding circumferential surface 2 a. Accordingly, the fitting chip 6 is formed to be flexible to the inside of the base member 2 by way of the line guiding groove portions.

[0053] Further, a fitted step portion 5 a can be formed at the upper end of the pressing member 5 so that the diameter of the fitted step portion 5 a is slightly smaller along the outer circumference than the diameter of the pressing member 5. The fitted step portion 5 a allows the point of the fitting chip 6 of the base member 2 to engage pressing member 5. Even in this embodiment, the fitted step portion 5 a of the pressing member 5 can be normally inserted into the insert space portion 2 s of the base member 2.

[0054] In FIG. 6, the fitting chips 6 of the base member 2 shrivel apart and flexibly to the inside when the pressing member 5 is taken out of the insert space portion 2 s of the base member 2. Then, the fitting chips 6 grab the fitted step portion 5 a and the tips of the fitting chips 6, touch and engage with the fitted step portion 5 a. Thus, the pressing member 5 can push up the base member 2 to the upper part of the case 1 without inserting again the tips into the insert space portion 2 s of the base member 2.

[0055] A base supporting portion 1 d is formed to support the base member 2 in the case 1. The base supporting portion 1 d prevents the insert space portion 2 s of the base member 2 from falling away from the case 1, as shown in FIG. 4(A), when the tip of the pressing member 5 is pulled out of the insert space portion 2 s. The base supporting portion 1 d is formed as a small protruding portion that protrudes slightly from the circumferential surface 1 a of the case 1 to the inside. With reference to FIGS. 2(A) and 2(B), it is sufficient for the base supporting portion 1 d to support the base member 2 with ease.

[0056]FIG. 8(A) shows a second embodiment of the present invention, comprised mainly of, the case 1, the base member 2 and the pressing member 5. FIG. 8(B) shows that each of the base member 2 and the pressing member 5 is a kind of block having a shape of semi-cylindrical. The base member 2 can be cylindrical and the hole-forming projection 3 is provided on the upper surface 2 b.

[0057] Referring to FIGS. 8(A), 8(B), 9(A) and 9(B), a pressured slope 2 c is formed in the lower end surface of the base member 2. In addition, two flat surfaces 2 c _(1A),2 c _(1B), are formed along the slope direction on both sides of the pressured slope 2 c. In the same way, a pressing slope 5 b is formed in the upper end surface of the pressing member 5. In addition, two flat touching surfaces 5 b _(1A),5 b _(1B) are formed along the slope direction on both sides of the pressing slope 5 b. Flat surfaces 2 c _(1A) and 2 c _(1B) contact corresponding surfaces 5 b _(1A) and 5 b _(1B) on pressing member 5. The flange 5 d is fixed to the lower end of the pressing member 5 by way of an axis member 5 e.

[0058] A guide projection 2 a ₁ is be formed on the sliding circumferential surface 2 a of the base member 2. The guide projection 2 a ₁ is inserted into a guide hole 1 e formed on a circumferential surface 1 a of the case 1. With guide projection 2 a ₁ inserted in guide hole 1 e, the base member 2 moves up and down inside the case 1 without rotating. Further, a pressing portion 4, for example a coiled spring 4 a, a stopping projection or the like, is provided between the top surface 1 b of the case 1 and the upper surface 2 b of the base member 2.

[0059] Referring to FIG. 8(A), the pressing member 5 rotates freely along the circumferential direction in the case 1. Normally, the pressured slope 2 c of the base member 2 and the pressing slope 5 b of the pressing member 5 keep touching to each other. Referring to FIG. 9(A), when the pressing member 5 is rotated in the circumferential direction, both of the two slopes come to be apart since the base member 2 is not rotatable Then, the flat surfaces 2 c _(1A) and 2 c _(1B) in the protrusion side come in contact with the flat surfaces 5 b _(1A) and 5 b _(1B).

[0060] Thus, as shown in FIG. 9(B), setting the length from the upper end of the base member 2 to the lower end of the pressing member 5 (including the flange 5 d) becomes enabled. In addition, pressing or hitting strongly the flange 5 d moves the base member 2 as far as the upper end of the case 1. As a result, the hole-forming projection 3 comes out of the upper end of the case 1.

[0061] Next, referring to FIGS. 10(A) and 10(B), as a second modified second embodiment of the present invention, the lower end of the base member 2 can be modified to a pressured unflat surface 2 d, which comprises of a convex portion 2 d ₁ and a concave portion 2 d ₂. In the same way, the upper end of the pressing member 5 can be modified to a pressing unflat surface 5 c, which comprises of a convex portion 5 c ₁ and a concave portion 5 c ₂. Normally, the pressured unflat surface 2 d and the pressing unflat surface 5 c are engaged. In order to perform hole forming in the bottom of the can receptacle C, the pressing member 5 should be taken out of the lower end of the case 1 by way of the flange 5 d with a circumferential rotation.

[0062] The engagement of the pressured unflat surface 2 d and the pressing member 5 is released, and both of the convex portions touch each other. Therefore, setting the length from the top surface 1 b of the base member 2 to the lower end of the pressing member 5 is feasible. In addition, as mentioned above, pressing or hitting strongly the flange 5 d triggers the base member 2 to move up as far as the upper end of the case 1. As shown in FIG. 11, the hole-forming projection 3 projects through the upper end of the case 1.

[0063] Referring to FIGS. 12(A) and 12(B), another variation of the second modified second embodiment of the present invention is shown. In FIG. 12(A), the convex portion 2 d ₁, of the pressured unflat surface 2 d of the base member 2 is located in the center of base member 2. Further, in FIG. 12(B), the convex portion 2 d ₁ of the pressured unflat surface 2 d of the base member 2 is formed on both sides of the center part. Convex portion 5 c ₁ of the pressing unflat surface 5 c of the pressing member 5 is located in the center of pressing member 5.

[0064] As in the first embodiment of the present invention, referring to FIG. 3(A), a fitting side of the present invention is fit to the bottom portion 10 of the can receptacle C. The upper end of the pressing member 5 is pulled out of the sliding circumferential surface 2 a of the base member 2 (or the lower end of the case 1) by way of the flange 5 d as shown in FIGS. 4(A) and 4(B). Thus, the fitting chip 6 of the pressing member 5 engages with the lower end of the base member 2. Then, the total length from the upper end of the base member 2 to the lower end of the pressing member 5 becomes longer, and the base member 2 is set for being moved up to the upper part of the case 1 by the pressing member 5. Further, referring to FIGS. 3(A)-(C), pressing the flange 5 d against the bottom portion 10 of can receptacle C causes the hole-forming projection 3 to come out of the upper end of the case 1. As a result, a hole is formed in the bottom portion 10 of can receptacle C.

[0065] Next, as in the second embodiment of the present invention (FIGS. 8 (A) and 8(B)), rotating the flange 5 d causes the pressing member 5 to rotate in the case 1. Then, the pressing slope 5 b also rotates and this rotation causes the pressing slope 5 b of the pressing member 5 to push up (or press) the pressured slope 2 c of the base member 2. As a result, referring to FIGS. 9(A) and 9(B), the total length consisting of the base member 2 and the pressing member 5 becomes longer.

[0066] Accordingly, pressing, pushing, or hitting strongly the flange 5 d causes the hole-forming projection 3 to come out of the upper end of the case 1, which forms a hole in the bottom portion 10 of the can receptacle C. Likewise, rotating the flange 5 d with pulling it out of the lower end of the case 1 enables the hole-forming in the bottom portion 10 of the can receptacle C.

[0067] In the invention, a base member 2 has a hole-forming projection 3. The hole-forming projection 3 is formed on an upper surface of the base member 2. The pressing member 5 is placed under the base member 2. A case 1 accommodates both the base member 2 and the pressing member 5 therein. In addition, the base member 2 is slidable upward to the upper part of the case 1 by pushing the pressing member 5 a part of which is taken out of the lower end of the case 1.

[0068] This configuration provides, various advantages, including, first, that it is possible to perform hole-forming operation with ease and safety.

[0069] More specifically, pulling out the pressing member 5 from the lower end of the case 1 by way of the flange 5 d completes preparation for forming a hole. With the pulled-out pressing member 5 pushing (pressing) the base member 2 upward to the upper part of the case 1, the hole-forming projection 3 is projected from the upper end of the case 1 by adding a pressure or a strong hit to the pressing member 5. This provides an easy and a safety operation for hole forming in the bottom portion 10 of the can receptacle C.

[0070] Next, the invention provides a hole-forming device including a case 1 fittable to a bottom portion 10 of a can receptacle C. A base member 2 is accommodated in the case 1. The base member 2 is slidable along the longitudinal direction of said case 1. A hole-forming projection 3 is formed on an upper surface of the base member 2. A pressing portion 5 fixes roughly the base member 2 so that the hole-forming projection 3 is normally accommodated in the case 1. A pressing member 5 is placed under the base member 2. The upper end of the pressing member 5 is inserted in a lower part of the base member 2. A fitting chip 6 are formed at least in either the base member 2 or the pressing member 5. In addition, the base member 2 is engaged with the pressing member 5 a part of which is taken out of the base member 2. The base member 2 is slidable upward to the upper part of the case 1 by pushing the pressing member 5. This configuration provides, various advantages, including, first, that it is possible to make the structure of the hole-forming device simpler, and to perform hole forming in the bottom of cans without fail.

[0071] More specifically, when the pressing member 5 is taken (pulled) out of the lower end of the case 1 by way of the flange 5 d, the point of the pressing member 5 inserted to the base member 2 comes apart from the base member 2. At the same time, the fitting chip 6 opens to the outside and the fitting chips 6 come in contact and engage with the lower end of the base member 2.

[0072] Thus, the total length from the upper end of the base member 2 to the lower end of the pressing member 5 gets longer. The pressing member 5 pushes the base member 2 up and, therefore, the hole-forming projection 3 comes out of the upper end of the case 1. This provides an easy operation to prepare for hole forming in the bottom portion 10 of the can receptacle C. In addition, pressing the pressing member 5 by way of the flange 5 d or hitting strongly the flange 5 d with a hammer or the like, causes projection of the hole-forming projection 3 out of the upper end of the case 1. This also provides an easy operation to prepare for hole forming in the bottom portion 10 of the can receptacle C.

[0073] Next, the present invention provides a hole-forming device including a case 1 fittable to a bottom portion of a can receptacle. A base member 2 is accommodated in the case 1. The base member 2 is slidable along the longitudinal direction of the case 1. A hole-forming projection 3 is formed on an upper surface of said base member 2. A pressing portion 4 fixes roughly the base member 2 so that the hole-forming projection 3 is normally accommodated in the case. A pressing member 5 is placed under the base member 2. An upper end of the pressing member 5 is inserted in a lower part of the base member 2. A fitting chip 6 is formed in the upper end of the pressing member 5, and protrudes to the outside elastically, and whereby the base member 2 is engaged with the pressing member 5 a part of which is taken out of the base member 2. The base member 2 is slidable upward to the upper part of the case 1 by pushing the pressing member 5.

[0074] This configuration provides various advantages, including making it possible to perform the hole forming operation with more stability when the base member 2 is moved upward to the upper part of the case 1 by pressing (pushing) the pressing member 5. More specifically, the fitting chip 6 contacts elastically with the inner surface of the case 1. Then, the fitting chips 6 engage with the lower end of the base member 2. Thus, the engagement between the fitting chips 6 and the lower end of the base member 2 becomes more tight, performing hole forming operation with more stability.

[0075] Next, the present invention provides a hole-forming device including a case 1 fittable to a bottom portion 10 of a can receptacle C. The base member 2 is accommodated in the case 1. The base member 2 is slidable along the longitudinal direction of the case 1. A hole-forming projection 3 is formed on an upper surface of the base member 2. The pressing portion 4 fixes roughly and movably the base member 2 so that the hole-forming projection 3 is normally accommodated in the case 1. The pressing member 5 is placed under the base member 2. The base member has a pressured slope 2 c as a lower end surface thereof. The pressing member 5 has a pressing slope 5 b as an upper end surface thereof. The pressing slope 5 b contacts with the pressured slope 2 c. A lower part of the pressing member 5 is protruded from the lower end of the case 1 by circumferential rotation of the pressing member 5.

[0076] This configuration provides various advantages, including making it possible to prepare for hole forming operation with more ease by only rotating the pressing member 5 by way of the flange 5 d. In addition, it is also possible to make the structure of the hole-forming device much simpler by forming the base member 2 and the pressing member 5 to be a cylindrical block. Further, any materials such as metals, synthetic resin and the like can be used for the disclosed hole-forming device.

[0077] Next, the present invention provides a hole-forming device including the case 1 fittable to a bottom portion 10 of the can receptacle C. The base member 2 is accommodated in the case 1. The base member 2 is slidable along the longitudinal direction of the case 1. The hole-forming projection 3 is formed on the upper surface of the base member 2. The pressing portion 4 fixes roughly and movably the base member 2 so that the hole-forming projection 3 is normally accommodated in the case 1. The pressing member 5 is placed under the base member 2. The base member 2 has a pressured unflat surface 2 d. The pressing member 5 has a pressing unflat surface 5 c. The pressing unflat surface 5 c contacts with the pressured unflat surface 2 d. The lower part of the pressing member 5 protrudes from the lower end of the case 1 by circumferential rotation of the pressing member 5.

[0078] This configuration provides various advantages, including making it possible to prepare for hole forming operation with more ease by only taking (pulling) out of the pressing member 5 with a rotation.

[0079] Next, the present invention provides a hole-forming device including a coiled spring 4 a instead of the pressing portion 4.

[0080] This configuration provides various advantages, including making it possible to hold (keep) the hole-forming projection 3 inside the case 1 so as not to protrude it from the case 1 for the purpose of safety. Also, it is possible to reduce the shock at the time of hole forming by the elasticity of the coiled spring 4 a. Further, it is possible to make the structure of the present invention much simpler because it is enough for performing hole forming to accommodate the coiled spring 4 a in the case 1. 

What is claimed is:
 1. A hole-forming device comprising: a base member having a hole-forming projection; said hole-forming projection being formed on an upper surface of said base member; a pressing member placed under said base member; a case accommodating both said base member and said pressing member therein; and said base member being slidable upward to the upper part of said case by pushing said pressing member a part of which extends beyond the lower end of said case.
 2. A hole-forming device comprising: a case fittable to a bottom portion of a can receptacle; a base member accommodated in said case; said base member slidable along the longitudinal direction of said case; a hole-forming projection being formed on an upper surface of said base member; a pressing portion fixing roughly said base member so that said hole-forming projection is normally accommodated in said case; a pressing member placed under said base member; an upper end of said pressing member being inserted in a lower part of said base member; a fitting chip formed at least in either said base member or said pressing member; and said base member being engaged with said pressing member a part of which is taken out of said base member, and said base member being slidable upward to an upper part of said case by pushing said pressing member.
 3. A hole-forming device as recited in claim 2 wherein: said fitting chip is formed in the upper-end of said pressing member, and protruding to the outside elastically.
 4. A hole-forming device comprising: a case fittable to a bottom portion of a can receptacle; a base member accommodated in said case; said base member slidable along the longitudinal direction of said case; a hole-forming projection being formed on an upper surface of said base member; a pressing portion fixing roughly and movably said base member so that said hole-forming projection is normally accommodated in said case; a pressing member placed under said base member; said base member having a pressured slope as a lower end surface thereof; said pressing member having a pressing slope as an upper end surface thereof; said pressing slope contacting with said pressured slope; and a lower part of said pressing member protruding from the lower end of said case by circumferential rotation of said pressing member.
 5. A hole-forming device comprising: a case fittable to a bottom portion of a can receptacle; a base member accommodated in said case; said base member slidable along the longitudinal direction of said case; a hole-forming projection being formed on an upper surface of said base member; a pressing portion fixing roughly and movably said base member so that said hole-forming projection is normally accommodated in said case; a pressing member placed under said base member; said base member having a pressured unflat surface; said pressing member having a pressing unflat surface; said pressing unflat surface contacting with said pressured unflat surface; and a lower part of said pressing member protruding from the lower end of said case by circumferential rotation of said pressing member.
 6. A hole-forming device as recited in claim 2 wherein: said pressing portion is a coiled spring.
 7. A hole-forming device as recited in claim 3 wherein: said pressing portion is a coiled spring.
 8. A hole-forming device as recited in claim 4 wherein: said pressing portion is a coiled spring.
 9. A hole-forming device as recited in claim 5 wherein: said pressing portion is a coiled spring. 